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This patch just reorganises the code to make possible to use alloca instead of malloc. This makes possible to use `.cfi_remember_state`/`.cfi_restore_state` on platforms without heap allocation. Also it will be safe to backtrace/unwind faults related to the allocator behind malloc. `_LIBUNWIND_REMEMBER_HEAP_ALLOC ` option reenables the heap usage for `.cfi_remember_state`/`.cfi_restore_state`. Define _LIBUNWIND_REMEMBER_STACK_ALLOC to force stack allocation. Reviewed By: #libunwind, mstorsjo Differential Revision: https://reviews.llvm.org/D85005